Vulvar varicose veins can have several causes. These causes are often interlinked, and several factors may be present simultaneously in the same woman.
Pregnancy
Pregnancy is the main cause of vulvar varicose veins. During this period, the body undergoes numerous changes that contribute to their development. Under the influence of oestrogen, the vein walls lose their tone, dilate more easily, and become more sensitive to pressure. At the same time, blood volume increases to ensure the necessary supply to the foetus, placing greater strain on the pelvic venous system. As the uterus grows in size, it also exerts direct pressure on the veins in the pelvis, which can impede the return of blood to the heart and exacerbate blood pooling in the vulvar veins. These changes are particularly pronounced during the second and third trimesters.
Pelvic Congestion Syndrome
This condition, which is sometimes poorly understood, is characterised by poor venous circulation in the pelvis. It is often caused by abnormal dilation of the ovarian, uterine or perineal veins. This venous congestion can extend as far as the vulvar veins. It often causes chronic pelvic pain, particularly towards the end of the day or after standing for long periods. This syndrome is exacerbated by a family history of varicose veins, multiple pregnancies, or persistent hormonal imbalances.
Genetic Predisposition
Heredity plays an important role in the development of vulvar varicose veins. If there is a family history of varicose veins, whether in the pelvis or the lower limbs, the risk of developing them yourself is higher. This predisposition may be due to a congenital weakness of the venous tissue.
Prolonged Standing
Jobs that require standing for long periods, such as shop assistants, hairdressers, nurses, etc., increase pressure in the veins of the lower body. This slows down venous return and increases the likelihood of varicose veins developing in the pelvis, perineum, or vulva. Conversely, a lifestyle that is too sedentary can also impair circulation.
Weight Gain
Being overweight puts extra pressure on the pelvic veins. This mechanical strain can interfere with the proper functioning of the venous valves, leading to blood pooling in the veins of the vulva.
Certain Sports Activities
Physical activities that significantly increase abdominal pressure, such as weightlifting or intensive strength training, can impede venous return and exacerbate circulatory problems. This can contribute to the development of varicose veins in the vulvar region.
Hormonal Changes (excluding pregnancy)
Apart from pregnancy, other hormonal imbalances can weaken the veins. Menopause, with its drop in oestrogen levels, or certain conditions such as polycystic ovary syndrome (PCOS), can make the vein walls more sensitive and promote their dilation.
Abnormalities Of The Venous System
Some women have venous malformations, whether congenital or acquired, which hinder proper blood drainage. The presence of pelvic tumours or foci of endometriosis can compress the veins. Compression syndromes, such as Cockett’s syndrome (compression of the left common iliac vein) or Nutcracker syndrome (compression of the left renal vein), increase pressure in certain pelvic veins. Finally, a history of deep vein thrombosis can lead to post-thrombotic syndrome and cause long-term disruption to venous return.
Other Aggravating Factors
Other factors can exacerbate pelvic venous disorders. Frequently wearing tight-fitting clothing around the pelvis can compress the superficial veins. Similarly, a history of pelvic surgery or local vascular trauma can impair circulation in this area.